/* ==================== 基础样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #e63946;
    --secondary-color: #c1121f;
    --accent-color: #f77f00;
    --text-dark: #1a1a2e;
    --text-gray: #666;
    --text-light: #999;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e5e5e5;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-white);
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 500;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-white);
    box-shadow: 0 4px 15px rgba(230, 57, 70, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(230, 57, 70, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--bg-white);
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ==================== 导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 32px;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    position: relative;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-dark);
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.btn-call {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: var(--accent-color);
    color: var(--bg-white);
    border-radius: 50px;
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(247, 127, 0, 0.3);
}

.btn-call:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(247, 127, 0, 0.4);
}

@media (max-width: 768px) {
    .btn-call {
        display: none;
    }
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: var(--transition);
}

/* ==================== 主视觉区域 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #c1121f 0%, #e63946 50%, #f77f00 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.05)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,149.3C960,160,1056,160,1152,138.7C1248,117,1344,75,1392,53.3L1440,32L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: var(--bg-white);

}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 24px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    font-size: 14px;
    margin-bottom: 30px;
    animation: fadeInDown 0.8s ease;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.title-line {
    display: block;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-features {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.8s both;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px 30px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-item i {
    font-size: 32px;
}

.hero-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.decoration-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    animation: float 6s ease-in-out infinite;
}

.circle-1 {
    width: 300px;
    height: 300px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.circle-2 {
    width: 200px;
    height: 200px;
    top: 50%;
    right: 15%;
    animation-delay: 2s;
}

.circle-3 {
    width: 150px;
    height: 150px;
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

/* ==================== 章节通用样式 ==================== */
section {
    padding: 100px 0;
    width: 100%;
    overflow-x: hidden;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header.align-left {
    text-align: left;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: linear-gradient(135deg, rgba(230, 57, 70, 0.1), rgba(193, 18, 31, 0.1));
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 18px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

.section-header.align-left .section-desc {
    margin: 0;
}

/* ==================== 业务范围 ==================== */
.services {
    background: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-white);
    border-radius: 16px;
    font-size: 32px;
    margin-bottom: 24px;
    box-shadow: 0 8px 20px rgba(230, 57, 70, 0.2);
}

.service-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.service-desc {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
}

.service-list {
    list-style: none;
    margin-bottom: 24px;
}

.service-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    font-size: 14px;
    color: var(--text-gray);
}

.service-list li i {
    color: var(--primary-color);
    font-size: 16px;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 15px;
}

.service-link:hover {
    gap: 12px;
}

/* ==================== 委托流程 ==================== */
.process {
    background: var(--bg-white);
}

.process-timeline {
    max-width: 900px;
    margin: 0 auto;
}

.process-phase {
    margin-bottom: 60px;
    position: relative;
}

.process-phase::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 80px;
    bottom: -40px;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-color), transparent);
}

.process-phase:last-child::before {
    display: none;
}

.phase-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.phase-number {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-white);
    border-radius: 50%;
    font-size: 24px;
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(230, 57, 70, 0.3);
}

.phase-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-dark);
}

.phase-steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding-left: 80px;
}

.step-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--bg-light);
    border-radius: 16px;
    transition: var(--transition);
}

.step-item:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    transform: translateX(10px);
}

.step-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-white);
    color: var(--primary-color);
    border-radius: 12px;
    font-size: 24px;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.step-content p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ==================== 核心优势 ==================== */
.advantages {
    background: linear-gradient(135deg, #c1121f 0%, #e63946 100%);
    color: var(--bg-white);
}

.advantages .section-tag {
    background: rgba(255, 255, 255, 0.15);
    color: var(--bg-white);
}

.advantages .section-title {
    color: var(--bg-white);
}

.advantages .section-desc {
    color: rgba(255, 255, 255, 0.8);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.advantage-card {
    position: relative;
    padding: 40px 30px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    transition: var(--transition);
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.05));
    opacity: 0;
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 255, 255, 0.4);
}

.advantage-card:hover::before {
    opacity: 1;
}

.advantage-icon {
    position: relative;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    font-size: 32px;
    margin-bottom: 24px;
}

.advantage-title {
    position: relative;
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 16px;
}

.advantage-desc {
    position: relative;
    font-size: 15px;
    line-height: 1.8;
    opacity: 0.9;
}

.advantage-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(247, 127, 0, 0.9);
    border-radius: 50%;
    font-size: 18px;
}

/* ==================== 新闻资讯 ==================== */
.news {
    background: var(--bg-light);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.news-card {
    background: var(--bg-white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.news-image {
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.news-card:hover .news-image img {
    transform: scale(1.1);
}

.news-category {
    position: absolute;
    top: 16px;
    left: 16px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: rgba(230, 57, 70, 0.95);
    backdrop-filter: blur(10px);
    color: var(--bg-white);
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
}

.news-content {
    padding: 24px;
}

.news-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 16px;
    font-size: 13px;
    color: var(--text-light);
}

.news-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.news-meta i {
    font-size: 14px;
}

.news-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.news-card:hover .news-title {
    color: var(--primary-color);
}

.news-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.news-link:hover {
    gap: 12px;
}

.news-link i {
    font-size: 12px;
}

.news-more {
    text-align: center;
}

/* ==================== 数据统计 ==================== */
.stats {
    background: linear-gradient(135deg, rgba(230, 57, 70, 0.05), rgba(193, 18, 31, 0.05));
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 30px;
    background: var(--bg-white);
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-white);
    border-radius: 50%;
    font-size: 28px;
    flex-shrink: 0;
}

.stat-content {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.stat-unit {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-color);
}

.stat-label {
    font-size: 14px;
    color: var(--text-gray);
    margin-top: 8px;
}

/* ==================== 联系我们 ==================== */
.contact {
    background: var(--bg-white);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--bg-light);
    border-radius: 16px;
    transition: var(--transition);
}

.contact-item:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    transform: translateX(10px);
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-white);
    border-radius: 12px;
    font-size: 22px;
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.contact-details p {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.contact-details span {
    font-size: 13px;
    color: var(--text-light);
}

.contact-notice {
    display: flex;
    align-items: start;
    gap: 12px;
    padding: 16px 20px;
    background: rgba(247, 127, 0, 0.1);
    border-left: 4px solid var(--accent-color);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-gray);
}

.contact-notice i {
    color: var(--accent-color);
    font-size: 20px;
    margin-top: 2px;
}

.contact-form-wrapper {
    position: sticky;
    top: 100px;
}

.contact-form {
    padding: 40px;
    background: var(--bg-light);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.form-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 30px;
}

.form-title i {
    color: var(--primary-color);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-group label i {
    color: var(--primary-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    font-family: inherit;
    background: var(--bg-white);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(44, 90, 160, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-notice {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-light);
}

.form-notice i {
    color: #27ae60;
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--text-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--bg-white);
    margin-bottom: 16px;
}

.footer-logo i {
    font-size: 32px;
    color: var(--primary-color);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    color: var(--bg-white);
    border-radius: 50%;
    font-size: 18px;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--bg-white);
    margin-bottom: 20px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--bg-white);
    padding-left: 5px;
}

.footer-contact {
    list-style: none;
}

.footer-contact li {
    display: flex;
    align-items: start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 14px;
}

.footer-contact i {
    color: var(--primary-color);
    font-size: 16px;
    margin-top: 2px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 14px;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.7);
    margin: 0 8px;
}

.footer-bottom a:hover {
    color: var(--bg-white);
}

/* ==================== 返回顶部 ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: var(--bg-white);
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* ==================== 悬浮咨询 ==================== */
.float-contact {
    position: fixed;
    right: 30px;
    bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 999;
}

.float-btn {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 26px;
    color: var(--bg-white);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    animation: pulse 2s ease infinite;
}

.float-phone {
    background: var(--primary-color);
}

.float-wechat {
    background: #07c160;
}

.float-btn:hover {
    transform: scale(1.1);
    animation: none;
}

/* ==================== 动画 ==================== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-20px) scale(1.05);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(230, 57, 70, 0.2);
    }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--bg-white);
        padding: 20px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding-top: 80px;
        min-height: 80vh;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
        margin: 0 auto 40px;
    }
    
    .hero-features {
        gap: 15px;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        max-width: 100%;
    }
    
    .feature-item {
        padding: 12px 16px;
        font-size: 13px;
    }
    
    .feature-item i {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-desc {
        font-size: 15px;
    }
    
    .phase-steps {
        padding-left: 0;
    }
    
    .process-phase::before {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-item {
        justify-content: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    
    .back-to-top,
    .float-contact {
        right: 15px;
    }
    
    .nav-wrapper {
        padding: 0;
    }
    
    .hero-decoration {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 20px;
    }
    .logo{
        font-size: 16px;
    }
    
    .hero-subtitle {
        font-size: 14px;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .service-card {
        padding: 24px 16px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .advantage-card {
        padding: 30px 20px;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .news-image {
        height: 180px;
    }
    
    .news-content {
        padding: 16px;
    }
    
    .contact-form {
        padding: 24px 16px;
    }
    
    .hero-content {
        padding: 0 10px;
        padding-top: 25px;
    }
    
    .hero-features {
        gap: 12px;
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-item {
        padding: 10px 12px;
        font-size: 12px;
    }
    
    .feature-item i {
        font-size: 24px;
        margin-bottom: 6px;
    }
    
    .feature-item span {
        font-size: 12px;
    }
}